Issue #2 expression fix, updated readme.

src/asl/parser.go

@@ -424,7 +424,7 @@ func parseIdentifier() string {
 	    output += "("+get().token
 	    next()
 	    expect("[")
-	    output += " select "+parseExpression(false)+")"
+	    output += " select ("+parseExpression(false)+"))"
 	    expect("]")
 	} else if accept("!") || accept("-") {
 		output = get().token

src/asl/parser_test.go

@@ -131,7 +131,7 @@ func TestParserWaitUntil(t *testing.T) {
 
 func TestParserArray(t *testing.T) {
 	got := getCompiled(t, "test/parser_array.asl")
-	want := "x = [1,2,3];\ny = (x select 1);\n"
+	want := "x = [1,2,3];\ny = (x select (1));\n"
 
 	equal(t, got, want)
 }